/*
 * Copyright 2015-2018 _floragunn_ GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
/*
 * Portions Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

import {parse, format} from 'url';

/**
 *
 * @param loginEndpoint
 * @param request - Optional, only needed if we should append a "nextUrl" query parameter
 * @returns {*}
 */
export function parseLoginEndpoint(loginEndpoint, request = null) {
    // Parse the login endpoint so that we can append our nextUrl
    // if the customer has defined query parameters in the endpoint
    let loginEndpointURLObject = parse(loginEndpoint, true);

    // Make sure we don't overwrite an existing "nextUrl" parameter,
    // just in case the customer is using that name for something else
    if (typeof loginEndpointURLObject.query['nextUrl'] === 'undefined' && request) {
        const nextUrl = request.getBasePath() + request.url.path;
        // Delete the search parameter - otherwise format() will use its value instead of the .query property
        delete loginEndpointURLObject.search;
        loginEndpointURLObject.query['nextUrl'] = nextUrl;
    }
    // Format the parsed endpoint object into a URL and return
    return format(loginEndpointURLObject);
}